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A 1.2 kW electric heater is connected to a 120 V source. What current flows through the
heater? Answer using GUESS method.
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- Find the current through a person and identify the likely effect on her if she touches a 120-V ac source: (a) if she is standing on a rubber mat and offers a total resistance of 300 k (b) if she is standing barefoot on wet grass and has a resistance of only 4000 k .Find the current through a person and identify the likely effect on her if she touches a 120-V AC source: (a) if she is standing on a rubber mat and offers a total resistance of 300 k; (b) if she is standing barefoot on wet grass and has a resistance of only 4000 k .Integrated Concepts Cold vaporizers pass a current through water, evaporating it with only a small increase in temperature. One such home device is rated at 3.50 A and utilizes 120 V AC with 95.0% efficiency. (a) What is the vaporization rate in grams per minute? (b) How much water must you put into the vaporizer for 8.00 h of overnight operation? (See Figure 20.42.)*******
- An electric appliance with a current of I and a resistance of R converts energy to other forms at a rate of P when connected to a 120-Volt outlet. What would be the new power rating (in terms of P) if ... a. ... the current is doubled (and the same 120-Volt outlet is used)? b. ... the current is halved (and the same 120-Volt outlet is used)? c. ... the resistance is doubled (and the same 120-Volt outlet is used)? d. ... the resistance is halved (and the same 120-Volt outlet is used)? e. ... the current is tripled (and the same 120-Volt outlet is used)? f. ... the resistance is tripled (and the same 120-Volt outlet is used)? g. ... the same appliance is powered by a 12-Volt supply? h. ... the same appliance is powered by a 240-Volt supply?A digital clock has a 1.2x10 4 resistor and is connected to a 115 V source. How much power does the clock use?The cost to operate a clothes dryer for a year is $80.25. If the rate for electrical energy is 8.8¢/kWh, and the clothes dryer is used for 700 hours in a year, what is the power rating of the clothes dryer? Explain in depth and clearly using this formula.
- An electric water heater is designed to produce 48 kWkW of heat when it is connected to a 240-V source. If the heater is 88 %% efficient, how long would it take to heat 51 galgal of water from 20∘C∘C to 60 ∘∘? Express your answer using two significant figures.1. Calculate the resistance of a resistor that has a voltage (potential difference) of 8 V across itwhen a current of 2 A flows through it. Draw the circuit diagram before doing the calculation. 2. Two 10 kΩ resistors are connected in series. Calculate the equivalent resistance. Draw the circuitdiagram before doing the calculation.What is the energy used to run a 9v circuit with a 90 ohm resistor for 10 seconds?
- A heater is rated to dissipate 2880 W when connected to a 120 V source. The current drawn by the device is?1. A 1⁄2 hp motor draws a current of 4.0 A from a 120-V line. (a) Calculate the electric power used by the motor. (b) Calculate the motor’s efficiency – that is, the work it does per unit time divided by the electrical power it uses. 2. Calculate the resistance of a carbon rod when at 60°C if its resistance at 0°C is 0.0180Ω.What voltage will produce 0.4 A of current through a 4800 resistor?
